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T Series Data Sheet
?
500 Watt AC-DC Converters
Output Voltage Regulation (Battery Charger)
In normal operating mode (neither in power limitation nor in
current limitation) the output is regulated by a voltage feedback
loop. It is adjusted to V o set and can be set by the cell voltage
selector switch to the appropriate float charge voltage of the
battery.
A control input (pin 28) allows for adjustment of the output
voltage either by a voltage source, a temperature sensor, or an
external potential divider (see External Output Voltage
Control ). For fine tuning, the converter is fitted with a trim
? V o
1.1%
0.55%
V o set
– 0.9%
05046a
I o / I o nom
potentiometer accessible from the rear side.
The output voltage relates to the output current and the input
Fig. 12
0.01
0.5
1
Typical output droop T1240/1740/1840
26.7 V
V o
06065a
28.25 V
25.25 V
19 V
voltage, which ensures current sharing without further
precautions, when several converters are connected in
parallel. An increase in output current and a decrease in input
voltage decrease the output voltage, according to the formula:
V o ≈ V o set tol + (0.5 – I o / I o nom ) ? ? V o l + ( ? V i – ? V i nom )/100 V ? ? V o V
The dynamic characteristic is shown in fig. 9.
0
15 A
20 A
I o
Output Power Limitation (Battery Charger)
Fig. 11a
Output characteristic of T1240 (typ.). The droop is shown in
fig. 12.
All battery charger versions exhibit an output power limitation
mode, where the output power is kept constant from 2.35 V/cell
(for lead acid batteries) to 1.6 V/cell.
54.5 V
V o
06066a
56.5 V
50.5 V
38 V
The maximum input current is limited to I i L . At lower input
voltage V i red , the maximum output power is limited to:
P o ≈ η ? V i red ? I i L ( η = efficiency approx. 90%).
Inhibit (Rectifier Version)
The rectifier version converters are equipped with a simple
inhibit function (with no adjustment of V o ). The converter is
enabled by a logic high signal and disabled by a logic low
0
10 A
14.5 A
I o
signal. This input is TTL/CMOS compatible, a resistor < 50 ?
disables the converter, a resistor > 30 k ? enables it. The
switch-on time t r , i.e., the time delay between powering until
Fig. 11b
Output characteristic of T1740 (typ.). The droop is shown in
fig. 12.
the full output power is available, is typically 100 ms.
The hold-up time at the output after inhibiting depends on the
load, the internal and external capacitance at the output.
Note: The inhibit input is protected against overvoltage up to 60 V.
V o
06067a
Table 6: Characteristics of the inhibit signal
40.88 V
42.4 V
37.9 V
Characteristics
Conditions
min
typ max Unit
V inh
Inhibit
V o = on
V i min – V i max
2.5
60
V
28.5 V
voltage
T C min – T C max
R inh
Resistance V o = on
30
k ?
to Vo–
V inh
Inhibit
V o = off
–0.7
0.4
V
voltage
0
11 A
16 A
I o
R inh
Resistance V o = off
50
?
t r
Switch-on time
V i nom
100
ms
Fig. 11c
until full power avail.
Output characteristic of LT1840 (typ.). The droop is shown in
P inh
Input power with
3
W
fig. 12.
inhibited unit
BCD20023 Rev AB, 02-Nov-2010
Page 9 of 31
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